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Magnetic Particle Inspection (MPI) is a non-destructive test method for the detection of surface discontinuities in ferrous materials. Sub surface discontinuities can be detected but to a limited degree. The test method involves application of a magnetic field externally or applying electric current through the material which in turn produces magnetic flux in the material. Simultaneously, visible ferrous particles are sprinkled or sprayed on the test surface.

The presence of a surface or near surface discontinuities in the material causes distortion in the magnetic flux which in turn causes leakage of the magnetic fields at the discontinuity. The magnetic particles are attracted by the surface field in the area of the discontinuity and adhere to the edges of the discontinuity appearing the shape of the discontinuity.

NDTL offers a range of portable units designed for reliable and efficient testing.

LIQUID PENETRANT EXAMINATION (PT)

Dye Penetrant Inspection also known as Liquid Penetrant Inspection or Penetrant Test (PT) is a fast, economical and widely used non destructive test method to detect surface-breaking discontinuities in all non-porous materials (metals, plastics, or ceramics).
Penetrant testing is based upon the principles of capillary action where liquid penetrates into a cavity. Penetrant testing is performed by cleaning the test surface thoroughly, applying colored or fluorescent penetrant, allowing penetration time and removal of excess penetrant followed by application of developer (dry or liquid form).

The developer assists to draw penetrant out from the surface breaking discontinuities.
After developer dwelling the test surface is examined for bleed out under natural light or black (UV) light (depending on the type of penetrant). Fluorescent Dye Penetrant Inspection (FDPI) is the most sensitive test method.

Maintaining a high-level of safety for the operations of cargo handling equipment is of critical importance to general industry. Load testing is generally performed on all cargo carrying units, baskets, containers, bins, skids, equipment packs and all other equipment in need of certification before transportation by lifting cranes, forklifts, etc… to determine the Safe Working Loads and Maximum Gross Weight limits.